Process for dyeing keratinous fibres with 2,6-dimethyl-1,4-diaminobenzene and/or 2,3-dimethyl-1,4-diaminobenzene and/or 2,6-diethyl-1,4-diaminobenzene in an acid medium and compositions employed

Abstract

Process for dyeing keratinous fibres, especially human keratinous fibres such as the hair, consisting in applying to these fibres a composition containing, in a medium suitable for dyeing, at least 2,6-dimethyl-l,4-diaminobenzene and/or 2,3-dimethyl-1,4-diaminobenzene and/or 2,6-diethyl-1,4-diaminobenzene, as well as its salts, and an oxidising agent, the pH of the composition applied to the fibres being less than 7 and the said composition not containing iodide ions in a sufficient quantity to oxidise the oxidation dye precursor.

I claim: 
     
       1. A process for dyeing keratinous fibers comprising applying to said fibers in an amount effective to dye said fibers an acid composition comprising in an aqueous medium suitable for dyeing said fibers a mixture of (i) an oxidation dye precursor selected from the group consisting of 2,6-dimethyl-1,4diaminobenzene, 2,3-dimethyl-1,4-diaminobenzene, 2,6-diethyl-1,4diaminobenzene and mixtures thereof, said oxidation dye precursor being present in an amount ranging from 0.02 to 10 percent by weight based on the total weight of said composition, (ii) an oxidizing agent present in an amount effective to oxidize said oxidation dye precursor, and (iii) an acid component present in a sufficient amount such that the said mixture has a pH less than 7, the said acid composition not containing iodide ions in an amount sufficient to oxidize said oxidation dye precursor. 
     
     
       2. The process of claim 1 wherein said oxidizing agent is selected from the group consisting of hydrogen peroxide, urea peroxide, an alkali metal bromate and a persalt. 
     
     
       3. The process of claim 1 wherein the pH of said mixture ranges from 3 to 6.9. 
     
     
       4. The process of claim 1 wherein said composition also contains one or both of an oxidation dye precursor selected from a para oxidation dye precursor and an ortho oxidation dye precursor, and present in an amount ranging from 0.02 to 10 percent by weight. 
     
     
       5. The process of claim 1 wherein said composition also contains from 0.02 to 10 percent by weight of a coupler selected from the group consisting of a meta-diphenol, a meta-aminophenol, a meta-ureidophenol, a meta-phenylenediamine, a meta-acylaminophenol, a meta-carbalkoxyaminophenol, α-naphthol, an ortho-diphenol, a diketo compound and a pyrazolone. 
     
     
       6. The process of claim 5 wherein said coupler is selected from the group consisting of 2,4-diamino-1,3dimethoxybenzene, 2,4-dihydroxyphenoxyethanol, 2,4dihydroxyanisole, meta-aminophenol, resorcinol, resorcinol monomethyl ether, 2-methylresorcinol, 2-methyl-5-[N-(β-hydroxyethyl)amino]phenol, 2-methyl-5-[N-(β-mesylaminoethyl) amino]phenol, 6-hydroxybenzomorpholine, 2,4-diaminoanisole, 2,4diaminophenoxyethanol, 6-aminobenzomorpholine, 2-[N-(β-hydroxyethyl)amino]-4-aminophenoxyethanol, 2-amino-4-[N-(β-hydroxyethyl)amino]-anisole, 2,4-diaminophenyl β,γ-dihydroxypropyl ether, 2,4-diaminophenoxyethylamine, 2-methyl-5aminophenol, 2,6-dimethyl-3-aminophenol, 3,4-methylenedioxyphenol, 3,4-methylenedioxyaniline and their salts. 
     
     
       7. The process of claim 1 wherein said composition also contains at least one of an anionic, cationic, nonionic or amphoteric surfactant present in an amount ranging from 0.1 to 55 weight percent, an antioxidant present in an amount ranging from 0.02 to 1.5 weight percent and a thickening agent present in an amount ranging from 0.1 to 5 weight percent. 
     
     
       8. The process of claim 1 wherein said aqueous medium suitable for dyeing said fibers is water or a mixture of water and a solvent selected from the group consisting of a C 2  -C 4  lower alkanol, glycerol, glycol, glycolether, diethyleneglycol, monoethylether, diethyleneglycol monomethyl ether, an aromatic alcohol and mixtures thereof. 
     
     
       9. The process of claim 1 wherein said composition is permitted to remain in contact with said fibers for a period of time ranging from 3 to 40 minutes, after which said fibers are rinsed and dried. 
     
     
       10. The process of claim 9 which includes, subsequent to rinsing said fibers and prior to drying said fibers, Shampooing and rinsing said fibers. 
     
     
       11. The process of claim 1 where in said composition said acid component is selected from the group consisting of hydrochloric acid, phosphoric acid, tartaric acid, citric acid and sulphonic acid. 
     
     
       12. A composition for dyeing keratinous fibers comprising a component A containing in an aqueous medium suitable for dyeing said fibers at least one oxidation dye precursor selected the group consisting of 2,6-dimethyl-1,4-diaminobenzene, 2,3-dimethyl-1,4-diaminobenzene, 2,6-diethyl-1,4-diaminobenzene and mixtures thereof, said oxidation dye precursor being present in an amount ranging from 0.02 to 10 percent by weight based on the total weight of said component A, said component A not containing iodide ions in an amount sufficient to oxidize said oxidation dye precursor, and   a component B comprising in an aqueous medium suitable for dyeing said fibers, an oxidizing agent present in an amount effective to oxidize said oxidation dye precursor,   and an acid component in a sufficient amount such that a mixture in proportions of 90 to 10% of said component A and of 10 to 90% of said component B, the said composition has a pH less than 7.   
     
     
       13. The composition of claim 12 wherein said component A has a pH ranging from 3 to 10.5. 
     
     
       14. The composition of claim 12 wherein said component A also contains one or both of (a) an oxidation dye precursor selected from a para oxidation dye precursor and an ortho oxidation dye precursor or a mixture thereof present in an amount ranging from 0.02 to 10 percent by weight and   (b) a coupler present in an amount ranging from 0.02 to 10 percent by weight.   
     
     
       15. The composition of claim 12 wherein said oxidation dye precursor is present in an amount ranging from 0.02 to 10 percent by weight relative to the total weight of said composition. 
     
     
       16. The composition of claim 12 which also contains at least one of a surfactant present in an amount ranging from 0.1 to 35 weight percent, a solvent, in addition to water, present in an amount ranging from 0.5 to 40 weight percent, a thickening agent present in an amount ranging from 0.1 to 5 weight percent, and an antioxidant present in an amount ranging from 0.02 to 1.5 weight percent. 
     
     
       17. The composition of claim 12 wherein said component B has a pH ranging from 1 to less than 7. 
     
     
       18. The composition of claim 12 where in said component B, said acid component is selected from the group consisting of hydrochloric acid, phosphoric acid, tartaric acid, citric acid 6and sulphonic acid. 
     
     
       19. A multicompartment kit for dyeing keratinous fibers comprising a first compartment housing component A defined in claim 12 and a second compartment housing component B defined in claim 12. 
     
     
       20. A process for dyeing keratinous fibers comprising admixing 90 to 10 weight percent of a component A containing in an aqueous medium suitable for dyeing said fibers at least one oxidation dye precursor selected from the group consisting of 2,6-dimethyl-1,4-diaminobenzene, 2,3-dimethyl-1,4-diaminobenzene, 2,6-diethyl-1,4-diaminobenzene and mixtures thereof, present in an amount ranging from 0.02 to 10 percent by weight based on the total weight of said component A, said component A not containing iodide ions in an amount effective to oxidize said oxidation dye precursor, with 10 to 90 weight percent of a component B containing, in an aqueous medium suitable for dyeing said fibers, at least one oxidizing agent in a sufficient amount to oxidize said oxidation dye precursor and an acid component in a sufficient amount such that the resulting mixture has a pH less than 7 and   immediately applying said mixture to said fibers in an amount effective to dye said fibers.   
     
     
       21. The process of claim 19 where in said component B, said acid component is selected from the group consisting of hydrochloric acid, phosphoric acid, tartaric acid, citric acid and sulphonic acid.